AD7010 Datasheet, PDF (1/8 Pages) Analog Devices – CMOS JDC p/4 DQPSK Baseband Transmit Port

a CMOS
JDC ␲/4 DQPSK Baseband Transmit Port
AD7010
FEATURES
Single +5 V Supply
On-Chip ␲/4 DQPSK Modulator
Root-Raised-Cosine Tx Filters, ␣ = 0.5
Two 10-Bit D/A Converters
4th Order Reconstruction Filters
Differential Analog Outputs
On-Chip Ramp Up/Down Power Control
On-Chip Tx Offset Calibration
Very Low Power Dissipation, 30 mW typ
Power Down Mode < 5 ␮A
On-Chip Voltage Reference
24-Pin SSOP
APPLICATIONS
Japanese Digital Cellular Telephony
GENERAL DESCRIPTION
The AD7010 is a complete low power, CMOS, π/4 DQPSK
modulator with single +5 V power supply. The part is designed
to perform the baseband conversion of I and Q transmit
waveforms in accordance with the Japanese Digital Cellular
Telephone system.
The on-chip π/4 Differential Quadrature Phase Shift Keying
(DQPSK) digital modulator, which includes the Root Raised
Cosine filters, generates I and Q data in response to the transmit
data stream. The AD7010 also contains ramp control envelope
logic to shape the I and Q output waveforms when ramping up
or down at the beginning or end of a transmit burst.
Besides providing all the necessary logic to perform π/4 DQPSK
modulation, the part also provides reconstruction filters to
smooth the DAC outputs, providing continuous time analog
outputs. The AD7010 generates differential analog outputs for
both the I and Q signals.
As it is a necessity for all digital mobile systems to use the lowest
possible power, the device has power down options. The
AD7010 is housed in a space efficient 24-pin SSOP (Shrink
Small Outline Package).
POWER
Tx DATA
Tx CLK
READY
BIN
FUNCTIONAL BLOCK DIAGRAM
DGND
V_DD
V_AA
AGND
π/4 DQPSK
MODULATOR
AD7010
10-BIT
I-DAC
RECONSTRUCTION
FILTERS
CALIBRATION CIRCUITRY
10-BIT
Q-DAC
RECONSTRUCTION
FILTERS
2.46V
REFERENCE
ITx
ITx
QTx
QTx
BOUT
MCLK
BYPASS
MODE1 MODE2
REV. B
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